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公开(公告)号：US20220137097A1
公开(公告)日：2022-05-05
申请号：US17648310
申请日：2022-01-19
Applicant: Allegro MicroSystems, LLC
Inventor： Shaun D. Milano , Bryan Cadugan , Michael C. Doogue , Alexander Latham , William P. Taylor , Harianto Wong , Sundar Chetlur
Abstract: Systems and methods described herein are directed towards integrating a shield layer into a current sensor to shield a magnetic field sensing element and associated circuitry in the current sensor from electrical, voltage, or electrical transient noise. In an embodiment, a shield layer may be disposed along at least one surface of a die supporting a magnetic field sensing element. The shield layer may be disposed in various arrangements to shunt noise caused by a parasitic coupling between the magnetic field sensing element and the current carrying conductor away from the magnetic field sensing element.
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公开(公告)号：US11112230B2
公开(公告)日：2021-09-07
申请号：US16282539
申请日：2019-02-22
Applicant: Allegro MicroSystems, LLC
Inventor： Alexander Latham , Maxim Klebanov
IPC: G01B7/30 , G01D5/20 , G01R33/00 , G01R33/028 , G01R33/06
Abstract: Methods and apparatus for a sensor with a main coil to direct a magnetic field at a rotating target for inducing eddy currents in an end of the target and a sensing element to detect a magnetic field reflected from the target, wherein the target end comprises a conductive surface. The reflected magnetic field can be processed to determine an angular position of the target.
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公开(公告)号：US20200169299A1
公开(公告)日：2020-05-28
申请号：US16200799
申请日：2018-11-27
Applicant: Allegro MicroSystems, LLC , Commissariat à l'énergie atomique et aux énergies alternatives
Inventor： Alexander Latham , Claude Fermon , Myriam Pannetier-Lecoeur
IPC: H04B5/00
Abstract: Methods and apparatus for providing data transfer with a drive coil to transmit information, a receive coil magnetically coupled to the drive coil, and a first magnetoresistive sensor proximate the receive coil to detect information from the receive coil. In embodiments, the drive and receive coils are separated by an isolation material. In embodiments, a signal isolator IC packages includes transmit and receive coils and a magnetic field sensing element coupled to the receive coil.
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公开(公告)号：US10578684B2
公开(公告)日：2020-03-03
申请号：US15895418
申请日：2018-02-13
Applicant: Allegro MicroSystems, LLC
Inventor： Bryan Cadugan , Rémy Lassalle-Balier , Alexander Latham , Paolo Campiglio , Noémie Belin
Abstract: A magnetic field sensor can include a substrate, a first magnetoresistance element disposed over the substrate and including a first maximum response axis and a first bias layer structure configured to generate a first bias magnetic field with a first magnetic direction between ninety degrees and sixty degrees relative to the first maximum response axis. The magnetic field sensor can also include a second magnetoresistance element disposed over the substrate and including a second maximum response axis parallel to the first maximum response axis and a second bias layer structure configured to generate a second bias magnetic field with a second magnetic direction parallel to the first magnetic direction and opposed to the first magnetic direction. The first and second magnetoresistance elements can each have a pair of electrical contacts for coupling to circuits.
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公开(公告)号：US10557873B2
公开(公告)日：2020-02-11
申请号：US15653820
申请日：2017-07-19
Applicant: Allegro MicroSystems, LLC
Inventor： Alexander Latham
Abstract: A current sensor for sensing a direct magnetic field generated by a current through a conductor includes at least one first magnetic field sensing element spaced from at least one second magnetic field sensing element, with the magnetic field sensing elements configured to sense the direct magnetic field at different magnitudes. The direct magnetic field has a first direct coupling factor with respect to the at least one first magnetic field sensing element and a second direct coupling factor with respect to the at least one second magnetic field sensing element. A feedback conductor configured to carry a feedback current generates a feedback magnetic field that has a first feedback coupling factor with respect to the at least one first magnetic field sensing element and a second feedback coupling factor with respect to the at least one second magnetic field sensing element. A circuit generates the feedback current based on the direct and feedback magnetic fields and a sense element senses the feedback current.
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Patent Agency Ranking
公开(公告)号：US20190391185A1
公开(公告)日：2019-12-26
申请号：US16013330
申请日：2018-06-20
Applicant: Allegro MicroSystems, LLC
Inventor： Georges El Bacha , Evan Shorman , Cory Voisine , Alexander Latham , William P. Taylor
Abstract: A current sensor integrated circuit including a magnetic field sensing element, a current conductor, an insulation structure, and a power calculation circuit is configured to meet safety isolation requirements. The current sensor integrated circuit may include or be used with isolation resistors to allow for voltage from a high voltage side to be sensed at a low voltage side of the circuit. The insulation structure, current sensor package, and isolation resistors can achieve at least 500 Vrms isolation.
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77.发明授权公开(公告)号：US10509058B2
公开(公告)日：2019-12-17
申请号：US15869620
申请日：2018-01-12
Applicant: Allegro MicroSystems, LLC
Inventor： Bryan Cadugan , Rémy Lassalle-Balier , Alexander Latham , Paolo Campiglio , Noémie Belin
Abstract: A current sensor can indirectly measure a sensed current by directly measuring static perturbing AC magnetic fields with magnetoresistance elements, the perturbing magnetic fields generated by perturbing coils. The sensed current can be indirectly measured by modulating or changing sensitivities of the magnetoresistance elements in a way that is directly related to the sensed current.
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公开(公告)号：US20190257909A1
公开(公告)日：2019-08-22
申请号：US15901135
申请日：2018-02-21
Applicant: Allegro MicroSystems, LLC
Inventor： Hernán D. Romero , Alexander Latham
Abstract: A magnetic field sensor comprises a first coil configured to generate a magnetic field having a first frequency and induce a reflected magnetic field from a target. A second coil configured to generate a diagnostic magnetic field having a second frequency is included. The diagnostic magnetic field is configured not to induce a reflected magnetic field from the target that is measurable by the magnetic field sensor. At least two magnetic field sensing elements detect the reflected magnetic field and the diagnostic magnetic field and generate a signal representing the reflected magnetic field and the diagnostic magnetic field. A processing circuit is coupled to the at least two magnetic field sensing elements and configured to receive the signal, extract a diagnostic magnetic field portion of the signal representing the diagnostic magnetic field, and generate an error signal if a fault is detected.
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公开(公告)号：US10290608B2
公开(公告)日：2019-05-14
申请号：US15702940
申请日：2017-09-13
Applicant: Allegro MicroSystems, LLC
Inventor： Alexander Latham , Joseph James Judkins, III
Abstract: Methods and apparatus for a signal isolator having first and second dies separated by a voltage barrier region, wherein transmit and receive paths of the first and second dies provide bi-directional transfer of feedback and/or diagnostic signals between the first and second die. In embodiments, transmitter refresh signals and receiver refresh signals are exchanged to detect fault conditions.
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公开(公告)号：US10101410B2
公开(公告)日：2018-10-16
申请号：US14918716
申请日：2015-10-21
Applicant: ALLEGRO MICROSYSTEMS, LLC
Inventor： Alexander Latham , Stephen Marshall , Aaron Cook
Abstract: Methods and apparatus for a sensor having non-ratiometric fault trip level setting. In embodiments, a sensor has a sensing element with a fixed gain. A signal processing module receives the fault trip level setting and maintains the fault trip level setting constant during changes in the supply voltage.
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